1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
package hotline
import (
"bufio"
"bytes"
"encoding/binary"
"errors"
"io"
)
type transfer struct {
Protocol [4]byte // "HTXF" 0x48545846
ReferenceNumber [4]byte // Unique ID generated for the transfer
DataSize [4]byte // File size
RSVD [4]byte // Not implemented in Hotline Protocol
}
var HTXF = [4]byte{0x48, 0x54, 0x58, 0x46} // (HTXF) is the only supported transfer protocol
func (tf *transfer) Write(b []byte) (int, error) {
if err := binary.Read(bytes.NewReader(b), binary.BigEndian, tf); err != nil {
return 0, err
}
if tf.Protocol != HTXF {
return 0, errors.New("invalid protocol")
}
return len(b), nil
}
const fileCopyBufSize = 524288 // 512k
func receiveFile(conn io.Reader, targetFile io.Writer, resForkFile io.Writer) error {
ffhBuf := make([]byte, 24)
if _, err := io.ReadFull(conn, ffhBuf); err != nil {
return err
}
var ffh FlatFileHeader
err := binary.Read(bytes.NewReader(ffhBuf), binary.BigEndian, &ffh)
if err != nil {
return err
}
ffifhBuf := make([]byte, 16)
if _, err := io.ReadFull(conn, ffifhBuf); err != nil {
return err
}
var ffifh FlatFileInformationForkHeader
err = binary.Read(bytes.NewReader(ffifhBuf), binary.BigEndian, &ffifh)
if err != nil {
return err
}
var ffif FlatFileInformationFork
dataLen := binary.BigEndian.Uint32(ffifh.DataSize[:])
ffifBuf := make([]byte, dataLen)
if _, err := io.ReadFull(conn, ffifBuf); err != nil {
return err
}
if err := ffif.UnmarshalBinary(ffifBuf); err != nil {
return err
}
var ffdfh FlatFileDataForkHeader
ffdfhBuf := make([]byte, 16)
if _, err := io.ReadFull(conn, ffdfhBuf); err != nil {
return err
}
err = binary.Read(bytes.NewReader(ffdfhBuf), binary.BigEndian, &ffdfh)
if err != nil {
return err
}
// this will be zero if the file only has a resource fork
fileSize := int(binary.BigEndian.Uint32(ffdfh.DataSize[:]))
bw := bufio.NewWriterSize(targetFile, fileCopyBufSize)
_, err = io.CopyN(bw, conn, int64(fileSize))
if err != nil {
return err
}
if err := bw.Flush(); err != nil {
return err
}
if ffh.ForkCount == [2]byte{0, 3} {
var resForkHeader FlatFileDataForkHeader
if _, err := io.ReadFull(conn, resForkHeader.ForkType[:]); err != nil {
return err
}
if _, err := io.ReadFull(conn, resForkHeader.CompressionType[:]); err != nil {
return err
}
if _, err := io.ReadFull(conn, resForkHeader.RSVD[:]); err != nil {
return err
}
if _, err := io.ReadFull(conn, resForkHeader.DataSize[:]); err != nil {
return err
}
bw = bufio.NewWriterSize(resForkFile, fileCopyBufSize)
_, err = io.CopyN(resForkFile, conn, int64(binary.BigEndian.Uint32(resForkHeader.DataSize[:])))
if err != nil {
return err
}
if err := bw.Flush(); err != nil {
return err
}
}
return nil
}
|
